Remote control switching



1941- E. SCHIMANN 2,266,519

REMOTE CONTROL SWITCHING Filed Sept. 12, 1938 A B I 1 I11 1,1

MI MI St1 $t1 IN VENTOR. ERNST SCH/MA NN ATTORNE Patented Dec. 16, 1941 ICE REMOTE CONTROL SWITCHING Ernst Schlmann, Berlin-Spandau, Germany, assignor to Fides Gesellschatt fiir die Verwaltnng nnd Verwertnng von gewerblichen Schutzrechten m. b. 11., Berlin, Germany Application September 12, 1938, Serial No. 229,459 In Germany September 14, 1937 2 Claims. (01. 177-411) The invention relates to the remote control of electric switches in particular in distance communication systems. a

It is known to control stepping magnets synchronously in such a manner that the stepping on of the controlling switches at the sending set is made compulsorily in dependence on the setting oi the controlled switch at the receiving set. Only when the latter has taken up the same setting as the former can a further operation of the controlling switchestake place. A disturbance of the synchronism has the result that both stepping mechanisms are no longer stepped on. For the remote control of the individual switches this method of supervising the simultaneous operation is obviously not required, since in this case the controlling step would-not give out a signal so that at the controlled set no corresponding stepping on of the switches takes place.

For the remote controlled individual switches it is already known to connect optical signals to the controlling set in dependence on the setting oi the remotely controlled switch. This arrangement has, however, the disadvantage that the expense of control lines and contacts is large, and moreover, it increases the number of sources oi error.

The invention avoids these disadvantages in that symmetrical switching means are provided at the switching set, which, by altering the setting oi the switch at the controlling set bring about a corresponding switching over of the switch at the controlled set; it the switching over at the controlled set is prevented, however, the setting back 01' the switch at the controlling set intoits original position is efiected.

The embodiment shows two switching sets A and B. These can for example be two long distance communication exchanges in which alternately in dependence on the initiating oi the switch means in the controlling exchange, the same switching operations are carried out in the other exchange. such an arrangement is also required for other fields in the light and heavy current technique.

The devices in the two sets A and B are completely symmetrical. Each set is provided with two operating magnets MI and nm which control a lever switch H. The arrangement is so constructed that the lever switch H is seized by the energizing oi the magnet M11 in the setting heavily outlined indicated by 83, while the lever switch is shifted over into the setting indicated by broken lines at Stl on the energizing oi the It is understood, however, that magnet MI. The lever switch H can also be switched over by hand. On the switching over of the, lever switchH two contacts M and MI mechanically dependent on the switch, are moved over.

The method of working is as follows:

When the lever switch H at the controlling set A is moved by hand from the setting St! indicated by heavy outline, into the setting Stl,

indicated by broken lines, the contacts M and 71.11 are also shifted. Thereupon the following circuit is closed for the magnet MI in the distance set B: earth, contact hIl, line Ltgl, contact hI2, magnet MI, battery, earth. The magnet MI is energized and attracts the lever switch H of the set 13 from its setting St! into the setting Stl indicated by broken lines. By the shifting of these latter levers the contacts M and MI are also moved over. Thus the circuit for the magnet MI of the set B is opened on the one hand, and on the other hand the circuit for the magnet M11 in the set A is interrupted, which previously extended as follows: earth, battery, magnet M11, in the set A, contact M13, line Ltgl, contact hill in the set B, earth. The magnets oi the two sets no longer receive current. The two lever switches H in the sets A and B are situated in the positions Stl indicated by broken lines.

When in the exchange B as a result of some electrical or mechanical disturbance, the switching over of the lever switch H does not take place, then after the release of the lever switch H of the set A the circuit of the magnet M11 0! this set is not interrupted; the magnet is energized and pulls the lever back into the set Stl. The controlled set A thus receives a reverse control since the switching over does not take place in the exchange B, and furthermore the magnets receive current and finally, the lever switches in the two sets are forced to take up the same position and undesired disturbance in the operation is prevented. These disturbances could, for example, make their presence felt in an undesirable manner in the use of the invention in telephone systems in which the two sets A and B would serve for intermediate exchanges, and over the two lever switches, alternately diiIerent line groups would be taken into use between exchanges.

As shown in the figure, it is assumed that the set B can alternatively serve as control exchange and theset A as the exchange which is being controlled. I

What is claimed is: 1. A circuit arrangement for the alternate remote control of electric switches, comprising a pair of switches connected by an electric connection, magnetic means for moving each switch from one position to another, means controlled by the movement of either switch from a first to a second position for completing a circuit for the magnetic means of the other switch over said connection, the magnetic means of said other switch responsive to the closure of said circuit to move said other switch to a position corresponding to that of said one switch, and means controlled by the movement'of the other switch for opening said circuit.

2. In a remote control system, a source and a two-position controlling member, a like source switch means responsive to a first position of the control member to connect its source, through that motor means which would move it, to the conductor means; like switch means and motor means responsive to alike position of the remote member to connect its source in opposition to the first; either switch means responsive to a second position of its member to make a connection excluding its said opposing source, including its other motor means, and both applying equal and opposed sources to the conductor means; whereby with both members in like positions no current flows through the conductor means and motor means, but with said members in difierent positions current flows pulling both members until movement of one of them, so that failure of the remote member to move by its motor means is indicated by restoration of the control memher when released.

ERNST SCHMANN. 

